I am just curious on how do the broadcast industry protect these things.
I toured a local FM Broadcast station last fall, after they Up-Graded
their 16Kw OUTPUT FM transmitter from a tube type transmitter that was 6
feet tall, 2 feet deep, and close to 16 feet wide. Ran a 4CX 15000 as a
final.
Now the transmitter same output and all, but the foot print is a unit
that is also 6 feet tall, and again about 2 feet deep. but only 3 feet
wide. And it actually could have been made smaller when opened it had a
LOT of empty space inside!
And here is something that MUST keep transmitting 100% duty cycle 24/7
or they loose big money.
I have zero knowledge of what the finals are that generates 16+ KW
OUTPUT on the FM broadcast band.
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 4/10/2017 4:31 PM, Jeff AC0C wrote:
This is the quandary of the solid state amp. The part can be blasted
in such a small time that there is a premium on the speed and
thresholds of the protection circuitry - too little or too late and,
well, it's part swapping time. Solid state is reliable if the limits
are not exceeded and that means even for what can be amazingly small
periods of time. A tube by comparison can generally be abused for a
relatively long period of time and not suffer damage which is one of
the reasons that I think tubes stick around - they are like that 350
chev - it's not the latest and greatest but it's known, it's rugged
and you can fix it if it breaks.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message----- From: Bill Turner
Sent: Monday, April 10, 2017 4:23 PM
To: Amps group
Subject: Re: [Amps] New Amplifier
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Mon, 10 Apr 2017 16:17:13 +0000 (UTC), Catherine wrote:
I've lost track of the number of times I've had to replace the IRF510
MOSFETs in my HFPacker 35 watt amp. This is a good little amp, but
it eats IRF510 transistors for breakfast. It is Class A, with two
devices in parallel.
REPLY:
Did you miss where I said "when not abused"?
I'm sure you are not personally abusing them, but something in the
environment is and they are clearly not being properly protected.
When you handle them, do you have an anti-static mat and wear a ground
wrist strap?
73, Bill W6WRT
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